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COMMITMENTS AND CONTINGENCIES (Details) (Pending litigation, adverse outcome, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Pending litigation, adverse outcome
Commitments and contingencies
Period for which litigation proceedings and other disputes have not been the subject of discussions or other significant activity	5 years
Accrued contingent liability	$ 5.0

X

- Definition

Represents the period for which litigation proceedings and other disputes, while not conclusively resolved, have not been the subject of discussions or other significant activity.

+ References

No definition available.

+ Details

Name:	atni_LossContingencyPeriodForWhichLitigationProceedingsWereNotSubjectOfDiscussionsOrOtherSignificantActivity
Namespace Prefix:	atni_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant